body
{
  display: block;
  height: 100%
}

.content
{
  box-sizing: border-box;
  padding: 1em;
  gap: 0.75em;
  width: 100%;
  height: 100%;
  flex-direction: column;
}

.background 
{
  position: fixed;
  display: grid;
  z-index: -1;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
  background: red;
}

.background img
{
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.content .error
{
  top: 0;
  left: 0;
  padding: 2em 1em;
  position: fixed;
  background: pink;
}

.content form
{
  width: min-content;
  background: #fff9;
  padding: 2.5em;
  line-height: 2em;
  margin: auto;
  display: grid;
  grid-gap: 1em;
}

input[type=text],
input[type=password]
{
  padding: 0.5em;
  background: #fffc;
}

input[type=submit]
{
  width: min-content;
  margin-top: 1em;
  padding: 0.5em;
  margin-right: auto
}